A description is given of the current test methods for the classification of dusts according to explosibility and, for explosible dusts, measurement of the minimum ignition temperature, minimum ignition energy, minimum explosible concentration, maximum explosion pressure and rate of pressure rise, and the maximum permissible oxygen concentration to prevent ignition of a dust cloud. The application of these tests to industrial processes is discussed and their limitations are surveyed in the context of the lack of background information on dust explosions. Further information is urgently needed on the mechanism whereby flame propagates from one dust particle to another in a dust explosion. Current work at the Fire Research Station on this topic is outlined.
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